Fix type hint for oauth_guest_endpoints

[aktech]

oauth_guest_endpoints is supposed to be a list of string instead, as can be seen in the documentation here:

panel/panel/io/server.py

Lines 899 to 900 in 7dd8908

	oauth_guest_endpoints: list (optional, default=None)
	List of endpoints that can be accessed as a guest without authenticating.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 81.80%. Comparing base (7dd8908) to head (a3301b3).
Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #7383      +/-   ##
==========================================
- Coverage   82.21%   81.80%   -0.41%     
==========================================
  Files         337      337              
  Lines       50514    50514              
==========================================
- Hits        41528    41325     -203     
- Misses       8986     9189     +203     

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